At the WatchTime show in NYC last October, we were dog-piling and pairing watches, and I noticed that my Chronomètre Souvrain was slower than the others. Having had it serviced & overhauled barely a year ago, I was concerned; so I headed for the FP Journe Boutique on Madison Avenue. William suggested it might be nothing more than a magnitized movement and told me to return for it later. I did so, and after a de-magnetized treatment , it's been fine ever since. Whewwwww!